What’s Vulnerable › Vulnerabilities

CVE-2026-55494: Tugtainer: Unauthenticated access to Tugtainer Agent Docker management APIs when AGENT_SECRET is unset

• Severity: critical (CVSS 9.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.6% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-09-30 · updated 2026-09-30
• Weakness: CWE-284

Description

Tugtainer is a self-hosted app for automating updates of Docker containers. Prior to version 1.30.4, Tugtainer Agent allows unauthenticated access to Docker management APIs when AGENT_SECRET is not configured. The Agent uses request signatures to protect its API routes. However, in agent/auth.py, the signature verification function returns successfully if Config.AGENT_SECRET is empty. This causes protected Agent APIs to become accessible without authentication. This issue has been patched in version 1.30.4.

Affected products

• Quenary tugtainer: before 1.30.4

References

• https://github.com/Quenary/tugtainer/commit/0052a5544e187a4d12f771838a8a23ca4afb61cd
• https://github.com/Quenary/tugtainer/releases/tag/v1.30.4
• https://github.com/Quenary/tugtainer/security/advisories/GHSA-wgw2-c96g-p7h7
• https://github.com/Quenary/tugtainer/security/advisories/GHSA-wgw2-c96g-p7h7

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